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v3.19.1

Biological Assets and Inventory - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 CAD ($) kg Plant wk | Dec. 31, 2017 CAD ($) kg Plant wk
Disclosure Of Detailed Information About Bio Assets And Inventory [Line Items] |  |
Expected cannabis yield | kg | 6,303 | 1,695
Number of plants classified as biological assets | Plant | 46,004 | 7,353
Average number of weeks | wk | 6 | 7
Percentage of completion | 37.00% | 46.00%
Percentage Ascribed | 37.00% | 46.00%
Dry cannabis [member] |  |
Disclosure Of Detailed Information About Bio Assets And Inventory [Line Items] |  |
Retention samples | kg | 29 | 4
Retention samples | $ | $ 0 | $ 0
Cannabis oils [member] |  |
Disclosure Of Detailed Information About Bio Assets And Inventory [Line Items] |  |
Retention samples | kg | 4 | 1
Retention samples | $ | $ 0 | $ 0

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- Definition Agricultural produce in hand as retention samples. + References No definition available. + Details
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Namespace Prefix: | cron_
Data Type: | xbrli:decimalItemType
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- Definition Average period. + References No definition available. + Details
Name: | cron_AveragePeriod
Namespace Prefix: | cron_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Definition Disclosure​ of detailed ​information​ about ​bio assets and inventory. + References No definition available. + Details
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Namespace Prefix: | cron_
Data Type: | xbrli:stringItemType
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- Definition Expected output of agricultural produce from existing biological assets. + References No definition available. + Details
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Namespace Prefix: | cron_
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- Definition Number of biological assets. + References No definition available. + Details
Name: | cron_NumberOfBiologicalAssets
Namespace Prefix: | cron_
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- Definition Percentage of completion. + References No definition available. + Details
Name: | cron_PercentageOfCompletion
Namespace Prefix: | cron_
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Balance Type: | na
Period Type: | duration

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- Definition Percentage of expected fair value at harvest date. + References No definition available. + Details
Name: | cron_PercentageOfExpectedFairValueAtHarvestDate
Namespace Prefix: | cron_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Retention samples. + References No definition available. + Details
Name: | cron_RetentionSamples
Namespace Prefix: | cron_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | cron_InventoryAxis=cron_CannabisOilsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |